ACCEL 5058B Blue Custom Fit Superstock Spiral Wire Set Features color-matched silicone spark plug boots, high gloss blue wire, stainless steel spark plug terminals Fits late model car and truck coverage True performance upgrade, increased ignition energy due to lower resistance, oversized upgrade where Original Equipment is 7mm 7mm and 8mm, 550 degrees Fahrenheit double silicone construction with a fiberglass braid Spiral wound stainless steel alloy conductor, magnetic suppression and semi-reactive material, fiberglass/Kevlar core, 500 Ohms per foot resistance